A spokesperson for the ITV show confirmed that they are discussing appointing a temporary replacement for Amanda Holden, who is to spend another week in hospital recovering from a number of blood transfusions after the birth of her daughter Hollie on Monday (January 23).
Insiders say that a guest judge is expected to be hired in time for London try-outs on February 6, with Klass and ex-EastEnders actress Womack emerging as frontrunners.
"We always had planned bringing in some special guest judges for when Amanda went off to have the baby," a source told The Mirror.
"We are sticking to three judges [in] Cardiff [this] weekend but we would like someone in the fourth seat by the time we film in London on February 6.
"Amanda knows she is welcome back but the show must go on and we need another judge as soon as possible."
Womack was rumoured to have been considered as one of the replacements for departed judges Michael McIntyre and David Hasselhoff, though Alesha Dixon and David Walliams ultimately took the roles.
Britain's Got Talent hosts Ant & Dec have already ruled out Alexandra Burke as a potential guest judge, describing her cameo on The X Factor last year as "bloody awful".
Watch Ant & Dec discuss the new series of Britain's Got Talent below: